like i said earlier just purchased evo yesterday and i am waiting on owners manual but in the meantime im trying to figure out what the switch next to my e-brake is for looks almost like a washer fluid picture on it and under the hood it has a tank (looks like washer or coolant tank)with the same picture and if anyone knows what would be the best spark plug to put in my evo would be i would appreciate the input

 

Intercooler sprayer, Fill the tank with washer fluid and set it on auto.

 

intercooler water spray button and reservoir.

 

Like many people say, it's a switch that gets the track wet.